Rihanna -- whose full name is Robyn Rihanna Fenty -- cleared her schedule so she could be in court if prosecutors call her as a witness, her lawyer, Donald Etra, said last month. Prosecutors told him they would call her, Etra said.

"She will definitely comply with the subpoena and any court order," he said.

Defense efforts to delay the hearing failed when the California Supreme Court decided Wednesday to deny a motion by Geragos to give him more time to look into a leak of police photos showing Rihanna's bruised and bloodied face.

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Schnegg ruled earlier that the leak is not relevant to the case against Brown. The judge said, however, she might change her mind before a trial.

Brown, who issued a public apology for the incident in February, recorded a short video posted on YouTube last month in which he said, "I ain't a monster."

He entered "not guilty" pleas in an earlier court appearance.

If Brown is convicted on the two counts, he could be sentenced to anywhere from probation to four years and eight months in prison, the Los Angeles County District Attorney's Office has said.

The alleged attack happened in February during an argument that began when Rihanna, who had been dating Brown, found a text message from another woman on his cell phone, according to a sworn police statement.